SA2015 V-MOSFET Builders

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Why not using 2 LEDs?
 

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The "button" can be anything you want with an o-ring to hold it in place (the PCB and push to make switch stop the button falling in and the o-ring stops it falling out). Machine some aluminum or plastic rod for example.
 
Crimping tool arrived. Cheap cable suitable for alarm systems was used as hook up wire.
Unfortunately,i haven't something better now.
These aren't tinned cables,expecting a better one from Distrelec.
 

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To improve interference rejection it is usual to use all the odd numbered cores as signal return/ground for the adjacent signal flow

Some use a single ground core but couple that to a pair of screen layers that lay on top and below the ribbon.
 
hopefully you are using pure isopropanol...
IMHO automotive paint thinner isn't save to clean the pcb and may destroy electronic parts. it looks like your cleaner has removed parts of the silk screen ...
No Toni,this has been used for many years.
Never i have seen any damaged part.
No this parts of the silk screen is exactly as it before the cleaning procedure.
 
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